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Definition of Limiting Oxygen Index(LOI)

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Time of issue:2016-12-22
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Definition of Limiting Oxygen Index(LOI)

The limiting oxygen index (LOI) is the minimum concentration of oxygen, expressed as a percentage, that will support combustion of a polymer. It is measured by passing a mixture of oxygen and nitrogen over a burning specimen, and reducing the oxygen level until a critical level is reached. [1]

LOI values for different plastics are determined by standardized tests, such as the ISO 4589 and ASTM D2863.

The differences bwtween several types of fibers.

Name	LOI
cotton	18
nylon	24
polyester	21
aramid	28

High oxygen index indicates that the material is not easy to burn, low oxygen index indicates that the material is easy to burn, generally considered oxygen index <22 belong to flammable materials, oxygen index between 22---27 is combustible material, oxygen index >27 is refractory material.

The LOI of Drotex flame retardant fabric is more than 28,if no doubt your first choice as protective clothing.Why not Contact us for more details?

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